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I've been doing some testing to find out if there is any possible way to generate energy in a uniform field.It appears that inductance can only occur in a changing magnetic field. If that's true then how is the homopolar working?

Is charge separation not working in a uniform field? Why doesn't the earths magnetic field cause beam shifting in a particle accelerator?Why was the screen on the old picture tube not shifted when the TV was moved to a different wall for the same reason?The earths magnetic field is strong enough to flip a magnet 180 degrees when dropped only 8 inches.

The field inside the clam shell is forming a tight loop and should have almost no stray field.Using a winding on the inner rotor, there is never any current produced regardless of whether the ring magnet was attached to the rotor or stationary.The only time any output was achieved was with the segmented field on one side of the clam shell. The other side could be stationary or moving with the rotor.

The scope shows about 400mv output as it passes the segmented field. Nothing is ever produced in the uniform field.

What I guess after watching your two videos is, you are bringing the metal strip from region of no flux (outside) into the region of flux (into the magnetic channel) hence there is variation of magnetic field which exerts force on the metal strip. But within the track, magnetic field is uniform with equal flux on both sides of strip and hence no force, making the strip to move freely.

When you complete the loop of that magnetic channel, there will be no starting point because the loop is endless. Hence there will be no force on the strip throughout the loop and metal strip may move freely throughout the loop just as the copper disc spinning above a ring magnet in your first video.

You are correct about the ring magnet not showing any force against the copper disk. What I was trying to find out is whether the charge separation is the same when entering the track as it is in the uniform center area.

The results show that the charge separation is the same entering the track as it is in the center uniform field. It only needs a path to allow the electrons to flow back to the depleted side of the separation.That means that the copper disk having no drag in the uniform field would have drag if there was a path for the charge separation to equalize.(the brushes on a homopolar generator make this path)It also shows that it's not so much the current flowing around the conductor that produces the drag but more the fact that the current is continuously flowing and doing work that causes drag.The current flow itself hinders the advancing magnetic field.

By examining all the details carefully, many answers are shown in these two simple tests.

The clue for a multi turn DC homopolar motor is in the scope shot that shows one side of the coil moving in a uniform field and the other side of the same coil moving in the segmented side.Suppose the segmented side rotated with the coil and the windings cut through the low field notches between the segments. This would leave a path for electron flow within the uniform field side of the coil.I was thinking that should be the next test.

What I found different in a uniform field is that there is no difference!When moving into a uniform field there is drag because there is still a conduction path. Once in the uniform field the conduction path is missing so there is no drag.If a conduction path is provided while moving in a uniform field then there is again drag.

The final proof that a uniform magnetic field causes the same current flow and lenz drag as expected.

All the poles are N along one side and S along the other so the flux flows in a circular path through the "C" channel and across the gap.This makes the field very tight across the gap with almost not field outside the setup.It becomes very clear what is going on in the uniform part of the field and in fact this setup causes all the field to be uniform right to the ends.

I'm now making some changes to the rotary device so that it will rotate only one ring magnet to see if there is a way to build a conduction path (without brushes) that will cause drag on the single rotating ring magnet. This is thought to be impossible and likely is, but if the flux is controlled in a tight loop it may be possible to have areas free of flux on the other side of the loop. This was seen in the copper disk setup.